<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>closure</title>
</head>
<body>
    <script>
        // getSalary(12000, 2000);
        // getSalary(15000, 3000);
        // getSalary(15000, 4000);

        function makeSalary(base) {
            return function (performance) {
                return base + performance;
            }
        }

        let salaryLevel1 = makeSalary(12000);
        let salaryLevel2 = makeSalary(15000);

        console.log(salaryLevel1(2000));
        console.log(salaryLevel2(2000));
    </script>
</body>
</html>